Refactor USB drive detection event handler

Moves the click event handler for detecting USB drives from the main UI script to the dedicated core handlers module.

This change centralizes UI logic, improving code organization and maintainability.

FFUDevelopment/FFUUI.Core/FFUUI.Core.Handlers.psm1

@@ -2,6 +2,22 @@ function Register-EventHandlers {
     param([PSCustomObject]$State)
     WriteLog "Registering UI event handlers..."
 
+    # Build Tab Event Handlers
+    $State.Controls.btnCheckUSBDrives.Add_Click({
+            param($eventSource, $routedEventArgs)
+            $window = [System.Windows.Window]::GetWindow($eventSource)
+            $localState = $window.Tag
+
+            $localState.Controls.lstUSBDrives.Items.Clear()
+            $usbDrives = Get-USBDrives
+            foreach ($drive in $usbDrives) {
+                $localState.Controls.lstUSBDrives.Items.Add([PSCustomObject]$drive)
+            }
+            if ($localState.Controls.lstUSBDrives.Items.Count -gt 0) {
+                $localState.Controls.lstUSBDrives.SelectedIndex = 0
+            }
+        })
+
     # Hyper-V tab event handlers
     $State.Controls.cmbVMSwitchName.Add_SelectionChanged({
             param($eventSource, $selectionChangedEventArgs)